Android: Where's My Droid can help you locate your phone whether you lost it in the couch…
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Whether you've lost your phone in your house and it's on silent, or you've left it somewhere in the city with no inkling as to where it may be, Seek Droid has you covered. It barely takes up any of your battery (which is more than can be said for most background apps) and can locate your device, send an alarm or message to the phone in case someone's found it, and even wipe it just in case. Not that you'll need to, since you've secured your phone with a lock pattern, right?

With phones falling into the wrong hands every day and California residents subject to warrantless…
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You can also hide the app from the app drawer and keep it from being uninstalled, so you won't ever lose its location. You can even grab your recent calls so you can keep up to date with your contacts while you work on getting your phone back. Setup is extremely simple—you just install it, set up your code, and that's it! The rest is done from the simple web interface, which requires minimal registration to use—you don't even need an email address. There's no reason you shouldn't have this on your phone.